2ae0fcfc5c
It'll be used to calculate a CoglPipeline layer matrix given viewport data. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3859>
63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
/*
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* Copyright (C) 2021-2024 Robert Mader <robert.mader@posteo.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "mtk/mtk-utils.h"
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void
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mtk_compute_viewport_matrix (graphene_matrix_t *matrix,
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int width,
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int height,
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float scale,
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MtkMonitorTransform transform,
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const graphene_rect_t *src_rect)
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{
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if (src_rect)
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{
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float scaled_width;
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float scaled_height;
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graphene_point3d_t p;
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scaled_width = width / scale;
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scaled_height = height / scale;
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graphene_point3d_init (&p,
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src_rect->origin.x / src_rect->size.width,
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src_rect->origin.y / src_rect->size.height,
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0);
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graphene_matrix_translate (matrix, &p);
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if (mtk_monitor_transform_is_rotated (transform))
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{
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graphene_matrix_scale (matrix,
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src_rect->size.width / scaled_height,
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src_rect->size.height / scaled_width,
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1);
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}
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else
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{
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graphene_matrix_scale (matrix,
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src_rect->size.width / scaled_width,
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src_rect->size.height / scaled_height,
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1);
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}
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}
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mtk_monitor_transform_transform_matrix (transform, matrix);
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}
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